The 150 sits directly on top of my 27" toshiba tube. It makes a slight "buzzing" not "humming" insect like noise when I put my ear up to the woofers, even when my receiver is completely unplugged. Turning the tv off eliminates the noise. My tv's picture, however, is not effected at all. The noise does increase noticeably when I turn the receiver on. I don't notice the buzzing in my other speakers and the sound occurrs with my subwoofer on or off. Anybody have any suggestions? I'm thinking it's some sort of shielding/interference problem but don't know how to fix it.

-Brian

Are you using a power line conditioner?

Call Joe at Axiom and he will guide you in analyzing the problem and come up with a solution.

Some 'buzzings' went on when i first received my speakers. Chek out this link.
old post on similar problem
And of course, call Joe.